Hilfeforum

Power supply fan speed increases

I launch Firefox and access the website. The destination website is simple, rich, regardless of type.
A few seconds after the website is displayed, the number of revolutions of the power supply fan increases and the sound of the fan increases. And although the temperature of the power supply unit does not change greatly, the rotational speed of the fan is nearly doubled. As soon as I close the Firefox window it starts to slow down.

I endure the noise of fans and use Firefox for 20-30 minutes continuously. At this time, even if the user does not operate it, the fan rotation speed maintains the high-speed range just by leaving the window open and leaving. As soon as the window is closed, the speed drops.

This doesn't happen with other web browsers. This happens even if I recreate the profile.

I launch Firefox and access the website. The destination website is simple, rich, regardless of type.
A few seconds after the website is displayed, the number of revolutions of the power supply fan increases and the sound of the fan increases. And although the temperature of the power supply unit does not change greatly, the rotational speed of the fan is nearly doubled. As soon as I close the Firefox window it starts to slow down.
I endure the noise of fans and use Firefox for 20-30 minutes continuously. At this time, even if the user does not operate it, the fan rotation speed maintains the high-speed range just by leaving the window open and leaving. As soon as the window is closed, the speed drops.
This doesn't happen with other web browsers. This happens even if I recreate the profile.
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Firefox 66.0.5 (This has been confirmed to occur from 66.0.), macOS 10.14.5, Mac Pro 2010

A small dialog should appear. Click
Start In Safe Mode (not Refresh).
Is the problem still there?

That sounds like the CPU is working harder than normal
on that website. Test: Go to that site. Then go somewhere
else. Does the fan slow down after a while?
Please provide a public link (no password) that we can
check out. '''No Personal Information Please ! '''
[https://support.mozilla.org/en-US/kb/troubleshoot-firefox-issues-using-safe-mode Start Firefox in Safe Mode] {web link}
A small dialog should appear. Click
'''Start In Safe Mode''' (not Refresh).
Is the problem still there?

Fragesteller

At this time, the usage rate of the CPU and the rotation speed of the CPU fan do not become abnormally high. CPU utilization is 14-20% when problems occur.
The problem is the rotational noise of the fan. Even if I intentionally lower the CPU or PCI fan speed, the volume of the fan noise does not change. When I lower the speed of the power supply fan, it becomes quiet.

https://www.google.com
It also happens here. I also occur in Safe Mode, of course, delete profiles and configure new.

At this time, the usage rate of the CPU and the rotation speed of the CPU fan do not become abnormally high. CPU utilization is 14-20% when problems occur.
The problem is the rotational noise of the fan. Even if I intentionally lower the CPU or PCI fan speed, the volume of the fan noise does not change. When I lower the speed of the power supply fan, it becomes quiet.
https://www.google.com
It also happens here. I also occur in Safe Mode, of course, delete profiles and configure new.

Fragesteller

Certainly my Mac Pro is 6-7 years old.
But this issue is definitely Firefox limited. Other applications do not run away like this. Fans do not run away when I browse the same site with Brave or Safari.

I'm trying a rudimentary hardware reset, such as SMC or PRAM clear. These seem to have no effect. I created a new user account for macOS, and running Firefox on that account would still cause the fans to run away.

Certainly my Mac Pro is 6-7 years old.
But this issue is definitely Firefox limited. Other applications do not run away like this. Fans do not run away when I browse the same site with Brave or Safari.
I'm trying a rudimentary hardware reset, such as SMC or PRAM clear. These seem to have no effect. I created a new user account for macOS, and running Firefox on that account would still cause the fans to run away.

There is no Retina on Mac Pro.
I tried the following.
* Disable hardware acceleration
* Disable "Stop access to the browser by the accessibility service"
* Limit memory on about:config
These were not effective either.

Fragesteller

Well, does it happen by chance only to Firefox?

Even with Final Cut Pro X or Parallels Desktop, which puts a strain on the Mac, this kind of abnormal rotation doesn't happen. They are not a power supply, and the rotational speed of the CPU and the fan of the PC slot increases. There is no abnormal rotation in Firefox of Parallels Desktop guest OS (Windows 10).

Why does Firefox only hit power fans? This is strange.

Well, does it happen by chance only to Firefox?
Even with Final Cut Pro X or Parallels Desktop, which puts a strain on the Mac, this kind of abnormal rotation doesn't happen. They are not a power supply, and the rotational speed of the CPU and the fan of the PC slot increases. There is no abnormal rotation in Firefox of Parallels Desktop guest OS (Windows 10).
Why does Firefox only hit power fans? This is strange.

Fragesteller

I downgraded to 65.0.2. It isn't a pure 65.0.2 because it is a profile that has been updated once to 67.

I was able to confirm that the runaway of the fan was settled in this condition. After that I used Firefox's refresh function to refresh my profile. There is almost no difference between 65.0.2 in this state and 65.0.2 immediately after downgrade.

And I updated it to 67.0 again. Then, the runaway of the fan started as before. If I return to 65.0.2 again, the rotation of the power supply fan will slow down.

I downgraded to 65.0.2. It isn't a pure 65.0.2 because it is a profile that has been updated once to 67.
I was able to confirm that the runaway of the fan was settled in this condition. After that I used Firefox's refresh function to refresh my profile. There is almost no difference between 65.0.2 in this state and 65.0.2 immediately after downgrade.
And I updated it to 67.0 again. Then, the runaway of the fan started as before. If I return to 65.0.2 again, the rotation of the power supply fan will slow down.

Use the computer/profile having the problem.
Give as much information as you can:
what is wrong, what you tried, results . . . .
List everything you can remember.

The website will read your user profile.
No Personal Information Is Collected.

And post a link to the report here.

I suggest you file a Bug Report here;
https://bugzilla.mozilla.org/
See Bugzilla etiquette before commenting in bug reports.
https://bugzilla.mozilla.org/page.cgi?id=etiquette.html
Use the computer/profile having the problem.
Give as much information as you can:
what is wrong, what you tried, results . . . .
List everything you can remember.
The website will read your user profile.
'''No Personal Information Is Collected.'''
And post a link to the report here.

Fragesteller

Immediately after Firefox starts up or at the time of initial loading of the Web page, CPU usage rises by about 24-50%, but after a while, it becomes stable at about 1-3%. The Energy Impact itself also remains "low". I don't think that memory usage or CPU usage is a problem.

Immediately after Firefox starts up or at the time of initial loading of the Web page, CPU usage rises by about 24-50%, but after a while, it becomes stable at about 1-3%. The Energy Impact itself also remains "low". I don't think that memory usage or CPU usage is a problem.

Fragesteller

It started to occur again at 67.0.2. However, it takes less time for the fan to stabilize at a lower speed than before.

But it's really strange. The fan does not rotate as fast as Firefox when I use Final Cut Pro X or Paralles Desktop (Windows 10). When I launch Firefox on virtualized Windows 10, the fan does not rotate as fast as the Mac version.
I check the energy impact on the activity monitor. So, for example, Parallels Desktop is 37%. Firefox for Mac is 9%. Firefox has lower energy impact than Parallels.

It started to occur again at 67.0.2. However, it takes less time for the fan to stabilize at a lower speed than before.
But it's really strange. The fan does not rotate as fast as Firefox when I use Final Cut Pro X or Paralles Desktop (Windows 10). When I launch Firefox on virtualized Windows 10, the fan does not rotate as fast as the Mac version.
I check the energy impact on the activity monitor. So, for example, Parallels Desktop is 37%. Firefox for Mac is 9%. Firefox has lower energy impact than Parallels.

Maybe this is about the graphics processor (GDU) load and not about the CPU.
Firefox 67 may be using WebRenderer and passes more tasks to the GPU and thus you ca get a lower CPU usage.

See also the graphics section on the "Help -> Troubleshooting Information" (about:support) page.

Maybe this is about the graphics processor (GDU) load and not about the CPU.
Firefox 67 may be using WebRenderer and passes more tasks to the GPU and thus you ca get a lower CPU usage.
See also the graphics section on the "Help -> Troubleshooting Information" (about:support) page.